h1{
    text-align: center;
}
h3{
    color: blue;
}
h4{
    color: red;
    margin-top: 20px;
    margin-bottom: 20px;
}
.content{
    margin-top: 30px;
}
img{
    max-height: 200px;
    max-width: 1000px;
}